4.2.1 Firmware Download
4.2.1 firmware download — compatible with 8 devices, released Unknown, build 8C148、8C148a、8C154. Download links direct to Apple servers, with signing status verification and SHA-256/SHA-1/MD5 checksum validation. 2 devices can still verify this firmware version.
iPhone (3)
3 devices support this version
| Device | Identifier | Build | Size | Signing | Action |
|---|---|---|---|---|---|
| iPhone 3G | iPhone1,2 | 8C148 | 323 MB | Signed | Details → |
| iPhone 3GS | iPhone2,1 | 8C148a | 401 MB | Unsigned | Details → |
| iPhone 4 (GSM) | iPhone3,1 | 8C148 | 624 MB | Unsigned | Details → |
iPad (1)
1 devices support this version
| Device | Identifier | Build | Size | Signing | Action |
|---|---|---|---|---|---|
| iPad 1 | iPad1,1 | 8C148 | 551 MB | Unsigned | Details → |
Apple TV (1)
1 devices support this version
| Device | Identifier | Build | Size | Signing | Action |
|---|---|---|---|---|---|
| Apple TV 2G | AppleTV2,1 | 8C154 | 267 MB | Unsigned | Details → |
iPod touch (3)
3 devices support this version
| Device | Identifier | Build | Size | Signing | Action |
|---|---|---|---|---|---|
| iPod touch 2G | iPod2,1 | 8C148 | 347 MB | Signed | Details → |
| iPod touch 3 | iPod3,1 | 8C148 | 389 MB | Unsigned | Details → |
| iPod touch 4 | iPod4,1 | 8C148 | 609 MB | Unsigned | Details → |